Abstract: An electrical discharge detection system that detects an output of noise superimposed on a voltage or a current of an electric circuit to which a load is connected includes a filter unit capable of extracting an output waveform in a specific frequency band, a division unit capable of dividing a certain time into a plurality of domains, and a determination unit capable of confirming a degree of continuity of domains in which an output of noise has been confirmed or comparing outputs of noise of a domain group in which a plurality of domains is collected.

Abstract: A plug-in discharge detection unit includes two plugs of a cathode and an anode configured to allow insertion into respective two plug insertion holes of a plug socket. A discharge detection section configured to allow detection of a noise of discharge superimposed on a voltage or current, and an arithmetic section configured to allow determination of whether discharge has occurred based on the noise. The detection unit further includes a ground terminal electrically connected to a ground; at least one first switch electrically connected to a secondary side of the respective plug; and a current limiting resistor electrically connected to a secondary side of the first switch.

Abstract: Provided is a discharge detector for detecting discharge occurred in a circuit with an electrically connected load based on a noise in a high frequency band superimposed on an alternating current power source supplied to the circuit.